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I would replace the olives. If they slide off OK, you would get away with leaving the existing barbs in. If they don’t (I swapped a lever recently and it wouldn’t come off) then you only need to trim the hose by the length of the barb. Then use new barb and olive - feels like the right thing to do.
In my case, cutting the hoses meant re-securing the hoses, which meant re-doing the bar tape. That bit was much more time consuming than cutting the hose and fitting a new barb, which only takes moments.
Sergeant_Pluck
Upgrading from R8020 to R8070 di2 levers. Going to reuse my hoses. Can I just reconnect them or do I need to trim the hoses a bit to fit new barbs and olives?